I have been poking around with online backup for a couple of days now
and are happy with the results in general, especially the runtime backup
capability. Most of the issues I came across I was able to work around
but there is one obstacles left that I need some help on. As long as I
use Neo's transactions programmatically taking backups work just fine at
any given point in time during regular Neo usage. But once I switch to
declarative transactions through the suggested Spring configuration
taken from the IMdb example I am running into all sorts of exceptions
after the first backup is taken. Below is the Spring configuration and
some exceptions I got. If helpful I could extend the online-backup test
suite with declarative transactions. Could there be some log file access
conflicts going on? It's probably worth mentioning that I am using
declarative transactions throughout the rest of our app and it's been
working just great after many stress tests and without using online backup.
Any thoughts on this one?
-Andreas
--- Spring configuration ---
<bean id="neoTransactionManagerService"
class="org.neo4j.impl.transaction.SpringTransactionManager"/>
<bean id="neoUserTransactionService"
class="org.neo4j.impl.transaction.UserTransactionImpl"/>
<bean id="neoTransactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="transactionManager"
ref="neoTransactionManagerService"/>
<property name="userTransaction" ref="neoUserTransactionService"/>
</bean>
---
--- Exceptions ---
java.nio.channels.ClosedChannelException
at sun.nio.ch.FileChannelImpl.ensureOpen(FileChannelImpl.java:91)
at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:192)
at org.neo4j.impl.transaction.TxLog.txStart(TxLog.java:143)
at org.neo4j.impl.transaction.TxManager.begin(TxManager.java:502)
at
org.neo4j.impl.transaction.UserTransactionImpl.begin(UserTransactionImpl.java:47)
at
org.springframework.transaction.jta.JtaTransactionManager.doJtaBegin(JtaTransactionManager.java:886)
at
org.springframework.transaction.jta.JtaTransactionManager.doBegin(JtaTransactionManager.java:843)
at
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:374)
...
org.springframework.transaction.CannotCreateTransactionException: JTA
failure on begin; nested exception is javax.transaction.SystemException:
TM encountered a problem, error writing transaction
log,java.nio.channels.ClosedChannelException
at
org.springframework.transaction.jta.JtaTransactionManager.doBegin(JtaTransactionManager.java:856)
at
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:374)
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